RTO vs RPO explained — what each means, a worked example, how to set them with a business impact analysis, and which DR strategy fits.
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Every disaster-recovery plan comes down to two targets: RTO and RPO. Get them right and you spend the appropriate amount protecting each system; get them wrong and you either overspend or discover the gap during an outage.
RTO is how quickly a system must be back online after a disruption — the maximum tolerable downtime. A payment system might have an RTO of minutes; an internal reporting tool might tolerate a day.
RPO is how much data you can afford to lose, measured in time — the maximum acceptable gap between your last good backup and the moment of failure. An RPO of 15 minutes means you must be able to recover to within 15 minutes of the incident.
Suppose your order database fails at 2:14 p.m. With an RPO of 15 minutes, you can restore to no earlier than 1:59 p.m. (so backups/replication must run at least that often). With an RTO of one hour, the database must be serving orders again by 3:14 p.m. Those two numbers dictate your backup frequency and your recovery architecture.
Start with a business impact analysis: for each system, quantify what an hour of downtime or an hour of lost data actually costs in revenue, compliance, and trust. Tighter targets cost more, so set them per system rather than applying one blanket number — reserve near-zero RTO/RPO for the systems that truly warrant it.
And remember: a plan you have never tested is a guess. RHC Solutions designs and tests these plans as part of business continuity and disaster recovery.
